Sewing machine



FIG. 1 is a top plan view of a sewing machine showing my new design;

FIG. 2 is an elevational view taken from one side;

FIG. 3 is an elevational view from one end;

FIG. 4 is an elevational view from the other side;

FIG. 5 is an elevational view from the other end; and

FIG. 6 is a bottom plan view thereof.

The ornamental design for a sewing machine, as shown.